Chrome的后台抓取API有什么替代方案？

使用Web Workers和IndexedDB API实现后台抓取操作。以下是实现示例：

1. 设置Web Worker文件（worker.js）中的抓取逻辑代码：

self.addEventListener('message', event => { const url = event.data; fetch(url) .then(response => response.blob()) .then(blob => { const reader = new FileReader(); reader.readAsDataURL(blob); reader.onloadend = () => { self.postMessage(reader.result); }; }); });

2. 在主线程中实例化Web Worker并在IndexedDB中存储结果：

// 实例化Web Worker，执行抓取操作 const worker = new Worker('worker.js'); worker.postMessage('https://example.com/image.jpg'); worker.addEventListener('message', event => { const imageUrl = event.data; // 存储结果到IndexedDB const dbPromise = indexedDB.open('images', 1); dbPromise.addEventListener('upgradeneeded', event => { const db = event.target.result; db.createObjectStore('images', { keyPath: 'url' }); }); dbPromise.addEventListener('success', event => { const db = event.target.result; const transaction = db.transaction('images', 'readwrite'); const objectStore = transaction.objectStore('images'); objectStore.add({ url: 'https://example.com/image.jpg', dataUrl: imageUrl }); }); });

3. 在需要使用抓取结果的地方从IndexedDB中取出结果：

const dbPromise = indexedDB.open('images', 1); dbPromise.addEventListener('upgradeneeded', event => { const db = event.target.result; db.createObjectStore('images', { keyPath: 'url' }); }); dbPromise.addEventListener('success', event => { const db = event.target.result; const transaction = db.transaction('images'); const objectStore = transaction.objectStore('images'); const request = objectStore.get('https://example.com/image.jpg'); request.addEventListener('success', event => { const imageUrl = event.target.result.dataUrl; // 使用抓取结果 }); });